Mixing device, plastic washing wastewater treatment system and treatment method

Abstract

The invention relates to the technical field of sewage treatment, and provides a mixing device, a plastic washing wastewater treatment system and a treatment method.The mixing device comprises a base, two mixing tank sets and an opening and closing driving part, and the two mixing tank sets are oppositely arranged on the base; the mixing tank group comprises a plurality of mixing tanks which are arranged in two rows; the opening and closing driving part is arranged on the base and is positioned between the two mixing tank groups; the opening and closing driving part is used for opening the mixing tanks of the two mixing tank groups so as to divide the mixing tanks into power tank bodies and communication tank bodies, and the communication tank bodies are in sliding fit with the base and are used for relatively closing the power tank bodies and the communication tank bodies and providing relative abutting force after closing. The mixing tank groups are used for mixing sewage, so that the blocking probability is reduced, the two mixing tank groups are respectively used for two mixing treatment procedures of plastic washing wastewater, and the same opening and closing driving part can realize opening and closing of the mixing tanks in the two mixing tank groups, so that the application cost is reduced, and the equipment structure is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly relates to a mixing device, a washing plastic wastewater treatment system and a treatment method. Background Art

[0002] The washing wastewater of polyester bottle chips mainly comes from the waste polyester bottle chip washing workshop, and contains impurities such as debris, adhesives, fruit juice, residual oil and sand, as well as chemical substances such as caustic soda, surfactants and defoamers. This kind of wastewater has the characteristics of strong alkalinity, high concentration and difficult degradation. Most of the organic substances in it are long-chain structures and high molecular weights, which are not easily degraded by microorganisms, resulting in poor biodegradability of the wastewater and being more complex to treat.

[0003] The existing invention patent with the authorized announcement number of CN111410334B provides a rapid recycling method for the wastewater produced by a hazardous waste plastic packaging container crushing and cleaning line, which relates to the technical field of wastewater treatment, and includes the following steps: The first step: Take the wastewater produced by the hazardous waste plastic packaging container crushing and cleaning line, and let it stand in the treatment pool for 10 minutes, and scrape off the upper floating oil with the oil separation plate. The second step: Add an acidic solution to the wastewater to adjust the pH value of the wastewater between 3 and 4. The third step: Add a mixed medicament to the above wastewater and stir evenly by air flotation; then add acid to adjust the pH value to about 5. The fourth step: Add a polyacrylamide solution to the above wastewater, and the solution concentration is 0.5%. The fifth step: Aerate and precipitate the above wastewater in the treatment pool for 30 minutes, and then the wastewater is solid-liquid separated to obtain the upper clarified liquid and the bottom filter residue. After adjusting the pH of the upper clarified liquid to between 6 and 8, it is recycled to the pre-washing pool.

[0004] In the above technical solution, when recycling the washing plastic wastewater, it uses the air flotation mixing method to mix the wastewater and the medicament. However, the air flotation mixing generally has the problem of high power consumption, which will affect the treatment cost; secondly, the air flotation mixing method is usually applicable to wastewater with low pollutant concentration and is not suitable for treating wastewater with high pollutant concentration. Moreover, the substances contained in the washing plastic wastewater are relatively complex, and the application of air flotation mixing has an unsatisfactory effect; at the same time, the air flotation equipment is difficult to maintain, and it is easy to cause pipeline blockage when the pollutant concentration is high, which will lead to an increase in maintenance costs; therefore, it is necessary to improve the convenience and economy of the wastewater treatment equipment during application to promote the development of technologies in the environmental protection field. Summary of the Invention

[0005] In view of this, the present invention proposes a mixing device, a washing plastic wastewater treatment system and a treatment method with good mixing effect, low energy consumption, and can effectively handle the washing plastic wastewater with high pollutant concentration, so as to solve the problems of high energy consumption, easy equipment blockage and difficult maintenance in the existing washing plastic wastewater treatment.

[0006] The technical solution of the present invention is realized as follows:

[0007] On the one hand, the present invention provides a mixing device, including a base, a mixing tank group, and an opening and closing driving member, wherein,

[0008] Two mixing tank groups are oppositely arranged on the base;

[0009] The mixing tank group includes a plurality of mixing tanks. The mixing tanks are horizontal tanks. The plurality of mixing tanks are arranged in two columns, and the mixing tanks in a single column are interconnected;

[0010] The opening and closing driving member is arranged on the base and is located between the two mixing tank groups;

[0011] The opening and closing driving member is used to open the mixing tanks of the two mixing tank groups to divide the mixing tanks into power tank bodies and communicating tank bodies. The communicating tank bodies are slidably matched with the base, and the opening and closing driving member is used to relatively close the power tank bodies and the communicating tank bodies and provide a relative abutting force after closing.

[0012] On the basis of the above technical solutions, preferably, the mixing tank further includes a stirring paddle, a sprocket, a chain, a first motor, and a communicating pipe, wherein,

[0013] The stirring paddle is located inside the mixing tank, and the paddle shaft of the stirring paddle penetrates through the power tank body;

[0014] The sprocket is arranged on the paddle shaft of the stirring paddle;

[0015] The chain is meshed with the sprocket;

[0016] The main shaft of the first motor is connected to the paddle shaft of the stirring paddle, and the first motor is relatively fixed to the base;

[0017] A plurality of communicating pipes are provided, and each communicating pipe connects two adjacent upper and lower communicating tank bodies.

[0018] On the basis of the above technical solutions, preferably, the mixing tank further includes a water inlet pipe, a chemical adding pipe, and a water outlet pipe, wherein,

[0019] The water inlet pipe and the chemical adding pipe are connected to the power tank body located at the uppermost part in a single column of mixing tanks;

[0020] The water outlet pipe is connected to the communicating tank body located at the lowermost part in a single column of mixing tanks.

[0021] On the basis of the above technical solutions, preferably, it further includes a connecting assembly. The connecting assembly includes an intermediate plate, a side plate, a transverse connecting rod, and a clamping mechanism. Flanges are arranged on the opposite surfaces of the power tank body and the communicating tank body, wherein,

[0022] Two intermediate plates are arranged between the two columns of mixing tanks. Card slots are arranged on both sides of the intermediate plate, and the card slots are attached to the power tank body or the communicating tank body;

[0023] There is one side plate provided on each side of the middle plate. The side plate is provided with a clamping groove facing the mixing tank, and the clamping groove fits the power tank body or the connecting tank body;

[0024] The transverse connecting rod is connected to the middle plate and the side plate;

[0025] The clamping mechanism is connected to two adjacent side plates to clamp the flanges on the opposite faces of the power tank body and the connecting tank body.

[0026] On the basis of the above technical solutions, preferably, the opening and closing driving member includes a two-way speed reducer, a second motor, a threaded cylinder, a screw rod, and a cross plate. Among them,

[0027] The two-way speed reducer is relatively fixed to the base, and the two-way speed reducer has two output shafts;

[0028] The second motor is relatively fixed to the base and is connected to the input shaft of the two-way speed reducer;

[0029] One threaded cylinder is provided on each of the two output shafts of the two-way speed reducer, and each is connected with a screw rod;

[0030] One end of the screw rod is threadedly connected with the threaded cylinder, and the other end is fixedly connected to the cross plate;

[0031] The cross plate is connected to the middle plate, and the length of the cross plate is greater than the distance between the axes of two adjacent mixing tanks in two rows of mixing tanks, so that the cross plate abuts against the side plate.

[0032] On the basis of the above technical solutions, preferably, three opening and closing driving members are provided, and the three opening and closing driving members are stacked up and down. Among them,

[0033] In the opening and closing driving members located on the upper side and the lower side, the cross plate abuts against the middle plate and the side plate.

[0034] On the basis of the above technical solutions, preferably, it further includes a carrier frame, and the carrier frame includes a frame body, a carrier plate, and a positioning plate. Among them,

[0035] The frame body is connected to the base and is located between two mixing tank groups;

[0036] A plurality of carrier plates are provided on the frame body, and the two-way speed reducer is arranged on the carrier plate;

[0037] A plurality of positioning plates are provided on the frame body, the threaded cylinder penetrates through the positioning plate, and the threaded cylinder is rotatably connected to the positioning plate.

[0038] On the basis of the above technical solutions, preferably, it further includes a cage, and the cage includes a limiting frame and a support frame. Among them,

[0039] The limiting frame is arranged between two rows of mixing tanks, and the limiting frame is snap-fitted with the mixing tank;

[0040] The support frame is connected to one row of mixing tanks, and the side surface of the support frame is flush with the side surface of the base.

[0041] On the other hand, the present invention provides a plastic washing wastewater treatment system, which includes the above-mentioned mixing device, and also includes a bipolar membrane reactor, a sedimentation tank, a flotation tank, an aeration tank, a secondary sedimentation tank and a chemical dosing device. Among them,

[0042] The water inlet of the sedimentation tank is communicated with the water outlet of a group of mixing tanks, and the water inlet of this group of mixing tanks is communicated with the acid liquid output pipe of the bipolar membrane reactor;

[0043] The water outlet of the sedimentation tank is communicated with the water inlet of another group of mixing tanks, and the water inlet of this group of mixing tanks is communicated with the alkali liquid output pipe of the bipolar membrane reactor. The water outlet of this group of mixing tanks is communicated with the water inlet of the flotation tank;

[0044] The water outlet of the flotation tank is communicated with the water inlet of the aeration tank, and the water outlet of the aeration tank is communicated with the water inlet of the secondary sedimentation tank;

[0045] The chemical dosing device is communicated with the bipolar membrane reactor.

[0046] On yet another aspect, the present invention provides an application method of the above-mentioned plastic washing wastewater treatment system, including the following steps:

[0047] S1. Through the chemical dosing device, pure water and sodium chloride, or pure water and sodium sulfate are added into the bipolar membrane reactor to prepare a solution with a mass concentration of 0.5% - 0.2%. Then the prepared solution is input into the bipolar membrane reactor.

[0048] S2. The plastic washing wastewater is introduced into the mixing tank of one group of mixing tanks, and the acid liquid generated at the anode of the bipolar membrane reactor is input into this mixing tank. Meanwhile, potassium ferrate with a concentration of 0.1% - 0.5% is added, and the pH value is controlled to be 2.0 - 4.0. Continuous stirring and mixing are carried out for 15 - 30 minutes.

[0049] S3. The plastic washing wastewater is introduced into the sedimentation tank and sedimented for 30 - 60 minutes.

[0050] S4. The plastic washing wastewater is introduced into the mixing tank of another group of mixing tanks, and the alkali liquid generated at the cathode of the bipolar membrane reactor is input into this mixing tank. Meanwhile, sodium hydroxide with a concentration of 0.1% - 0.5% is added, and the pH value is controlled to be 6.5 - 7.0. Continuous stirring and mixing are carried out for 15 - 30 minutes.

[0051] S5. The plastic washing wastewater is introduced into the flotation tank to remove the flotation sludge. Subsequently, the plastic washing wastewater is introduced into the aeration tank. The aeration tank controls the dissolved oxygen to be 2.0 - 3.0 mg / L, and the residence time is 16 - 24 hours.

[0052] S6. Feed the plastic washing wastewater into the secondary sedimentation tank for separation of mud and water. After the supernatant meets the standards, it is discharged.

[0053] Among them, during shutdown maintenance, the mixing tank is divided into a power tank body and a communicating tank body by an opening and closing driving member, and then internal flushing is carried out. After cleaning, the power tank body and the communicating tank body are relatively closed by the opening and closing driving member, and a relative abutting force after closing is provided.

[0054] The mixing device, plastic washing wastewater treatment system and treatment method of the present invention have the following beneficial effects compared with the prior art:

[0055] (1) By setting a mixing tank group for mixing sewage, the blockage probability is reduced and the energy consumption is relatively low. There are two mixing tank groups, which can be respectively used for two mixing treatment processes of plastic washing wastewater. The same opening and closing driving member can realize the opening and closing of the mixing tanks in the two mixing tank groups, so that while reducing the application cost of the device, the equipment structure is simplified and the convenience of cleaning is improved.

[0056] (2) A single mixing tank group includes two rows of mixing tanks, so that the opening and closing driving member can be fully utilized to synchronously realize the opening and closing work. And the side-by-side structure setting can effectively increase the sewage treatment capacity. When treating sewage, the sewage can flow step by step in multiple mixing tanks by gravity, which is not only beneficial to improving the mixing effect, but also can realize continuous sewage treatment work and ensure the sewage treatment efficiency.

[0057] (3) In the mixing tank structure, the stirring paddle, sprocket and first motor for stirring and mixing are arranged corresponding to the power tank body, while the connecting pipe for the step-by-step flow of sewage is arranged with the communicating tank body. In this way, they do not interfere with each other and do not affect the action of the opening and closing driving member, having the advantage of reasonable structural layout.

[0058] (4) In the connection assembly, the flanges at the ends of the power tank body and the communicating tank body are clamped and fixed through an intermediate plate and a side plate. The intermediate plate and the side plate are connected by a transverse connecting rod, and the clamping mechanism is used for connecting adjacent side plates. In this way, after the power tank body and the communicating tank body are docked and closed by the opening and closing driving member, the sealing effect can be further improved, thus ensuring the sealing performance.

[0059] (5) In the structure of the opening and closing driving member, the second motor and the two-way reduction gear drive the threaded cylinder to rotate, and then drive the screw rod and the cross plate to displace, so as to pull the communicating tank body to move, thereby realizing the opening and closing of the mixing tank. After the mixing tank is closed, this structure can apply a force to the communicating tank body to abut against the power tank body, so as to realize the opening and closing driving and the abutting sealing effect, having the advantage of multi-functionality.

[0060] (6) In this treatment method, a bipolar membrane reactor is applied to prepare alkaline water and acidic water as reaction agents for wastewater, and at the same time, two mixing tank groups are combined to achieve two mixing processes, which effectively simplifies the equipment structure and treatment process and reduces the application cost. At the same time, combined treatment is also carried out through a sedimentation tank, a flotation tank, an aeration tank and a secondary sedimentation tank, which can effectively remove the complex mixture in the plastic washing wastewater, thereby effectively improving the sewage treatment effect and efficiency. Brief Description of the Drawings

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0062] Figure 1 Is a perspective view of the mixing device of the present invention;

[0063] Figure 2 Is a front view of the mixing device of the present invention;

[0064] Figure 3 Is a rear view of the mixing device of the present invention;

[0065] Figure 4 Is a top view of the mixing device of the present invention;

[0066] Figure 5 Is a split structure diagram of the base and the mixing tank group of the mixing device of the present invention;

[0067] Figure 6 Of the present invention Figure 5 Enlarged structure diagram of point A;

[0068] Figure 7 Is an exploded view of the mixing device of the present invention;

[0069] Figure 8 Is a split structure diagram of the mixing tank group and the connecting components of the mixing device of the present invention;

[0070] Figure 9 Is a split structure diagram of the power tank body and the communicating tank body of the mixing device of the present invention;

[0071] Figure 10 Is a structure diagram of the plastic washing wastewater treatment system of the present invention;

[0072] In the figure: 1, base; 2, mixing tank group; 21, mixing tank; 211, power tank body; 212, connecting tank body; 213, stirring paddle; 214, sprocket; 215, chain; 216, first motor; 217, connecting pipe; 218, water inlet pipe; 219, chemical dosing pipe; 220, water outlet pipe; 3, opening and closing driving member; 31, two-way speed reducer; 32, second motor; 33, threaded cylinder; 34, screw rod; 35, cross plate; 4, connecting component; 41, middle plate; 42, side plate; 43, transverse connecting rod; 44, clamping mechanism; 401, clamping groove; 5, carrier; 51, frame body; 52, carrier plate; 53, positioning plate; 6, cage; 61, limiting frame; 62, support frame; 7, bipolar membrane reactor; 71, electrolytic cell; 72, power supply; 73, anode plate; 74, cathode plate; 75, ion exchange membrane; 8, sedimentation tank; 9, flotation tank; 10, aeration tank; 11, secondary sedimentation tank; 12, chemical dosing device. Specific embodiments

[0073] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0074] As Figures 1 to 10 shown, the mixing device of the present invention includes a base 1, a mixing tank group 2, an opening and closing driving member 3, a connecting component 4, a carrier 5 and a cage 6;

[0075] The plastic washing wastewater treatment system of the present invention includes the above-mentioned mixing device, and further includes a bipolar membrane reactor 7, a sedimentation tank 8, a flotation tank 9, an aeration tank 10, a secondary sedimentation tank 11 and a chemical dosing device 12.

[0076] As Figures 1 to 4 shown, two mixing tank groups 2 are oppositely arranged on the base 1; the mixing tank group 2 includes a plurality of mixing tanks 21, the mixing tanks 21 are horizontal tanks, the plurality of mixing tanks 21 are arranged in two columns, and the mixing tanks 21 in a single column are interconnected;

[0077] In the above structure, the base 1 is used for supporting and fixing. Two mixing tank groups 2 are installed on the base 1. Each mixing tank group 2 is composed of a plurality of mixing tanks 21 stacked one above the other. The plurality of mixing tanks 21 are divided into two groups, and the mixing tanks 21 in each group are interconnected. In this way, a single mixing tank group 2 can simultaneously treat two groups of sewage, and the sewage flows downward step by step through the upper mixing tank 21, thereby effectively improving the mixing effect of the sewage and the medicine.

[0078] Among them, the mixing tank 21 is a horizontal tank, which can reduce the overall height and improve the convenience of grouping; at the same time, when mixing, it is carried out inside the tank, which can effectively reduce the probability of pipeline blockage, thereby reducing the operation and maintenance costs; when the mixing tank 21 is applied, it can be stirred by a stirring paddle, which can reduce energy consumption and improve economy.

[0079] As Figure 2 and Figure 9 As shown, the opening and closing driving member 3 is arranged on the base 1, and the opening and closing driving member 3 is located between the two mixing tank groups 2; the opening and closing driving member 3 is used to open the mixing tank 21 of the two mixing tank groups 2 to divide the mixing tank 21 into a power tank body 211 and a communicating tank body 212, the communicating tank body 212 is slidably matched with the base 1, and the opening and closing driving member 3 is used to relatively close the power tank body 211 and the communicating tank body 212, and at the same time provide a relative abutting force after closing;

[0080] For the above structure, the opening and closing driving member 3 can synchronously open the multiple mixing tanks 21 in the mixing tank group 2, so that the mixing tank 21 is divided into two parts, the power tank body 211 and the communicating tank body 212. In this way, both the power tank body 211 and the communicating tank body 212 have relatively large openings, which can effectively improve the convenience of internal flushing and reduce the operation and maintenance difficulty;

[0081] Among them, while the opening and closing driving member 3 plays the role of docking and closing and separating the two parts of the power tank body 211 and the communicating tank body 212, it also provides a relative abutting force when closing; among them, the communicating tank body 212 is slidably connected to the base 1 and is a moving part. Therefore, the opening and closing driving member 3 applies a force to abut the power tank body 211 to the communicating tank body 212, so as to ensure good sealing effect after the two are docked;

[0082] Specifically, on the opposite surfaces of the power tank body 211 and the communicating tank body 212, sealing measures such as sealing rings are set to make the two have good sealing performance after docking and prevent water leakage problems.

[0083] As Figures 3 to 9 As shown, the mixing tank 21 further includes a stirring paddle 213, a sprocket 214, a chain 215, a first motor 216 and a communicating pipe 217. Among them, the stirring paddle 213 is located inside the mixing tank 21, and the paddle shaft of the stirring paddle 213 penetrates through the power tank body 211; the sprocket 214 is arranged on the paddle shaft of the stirring paddle 213; the chain 215 meshes with the sprocket 214; the main shaft of the first motor 216 is connected to the paddle shaft of the stirring paddle 213, and the first motor 216 is relatively fixed to the base; multiple communicating pipes 217 are arranged, and each communicating pipe 217 communicates two adjacent communicating tank bodies 212 up and down;

[0084] In the above structure, the mixing tank 21 uses the stirring paddle 213 to mix the sewage and the medicament inside. The form of the stirring paddle 213 can be set according to specific requirements.

[0085] To drive the stirring paddle 213, a sprocket 214, a chain 215 and a first motor 216 are used in cooperation. Since there are multiple mixing tanks 21, multiple stirring paddles 213 and sprockets 214 are provided. One chain 215 is provided and meshes with multiple sprockets 214. Then, one first motor 216 is connected to the paddle shaft of one stirring paddle 213 for driving, so as to reduce the number of transmission components and power components and lower the cost of the equipment.

[0086] Among them, the communicating tanks 212 of adjacent mixing tanks 21 can be connected through a communicating pipe 217, so that the sewage can flow downward step by step from the uppermost mixing tank 21.

[0087] Furthermore, a solenoid valve is provided on the communicating pipe 217 to control the on-off of the sewage.

[0088] As Figure 3 shown, the mixing tank 21 further includes a water inlet pipe 218, a chemical addition pipe 219 and a water outlet pipe 220. Among them, the water inlet pipe 218 and the chemical addition pipe 219 are connected to the power tank 211 at the uppermost part in the single-row mixing tank 21; the water outlet pipe 220 is connected to the communicating tank 212 at the lowermost part in the single-row mixing tank 21.

[0089] In the above structure, the water inlet pipe 218 is used to input sewage into the mixing tank 21, the chemical addition pipe 219 is used to add medicament into the mixing tank 21, and the water outlet pipe 220 is used to discharge the sewage.

[0090] Specifically, the water inlet pipe 218 and the chemical addition pipe 219 are only provided on the uppermost mixing tank 21. After the sewage and the medicament enter the mixing tank 21, they can be preliminarily mixed first. Then, the communicating pipe 217 is opened, and the sewage will flow downward. By controlling the solenoid valves on multiple communicating pipes 217, the step-by-step flow of the sewage can be realized. When the sewage flows into the lowermost mixing tank 21 and is mixed, the mixing is completed. At this time, the sewage is sent into the sedimentation tank through the water outlet pipe 220.

[0091] In this way, the mixing device can work continuously, retaining the advantages of small volume and ensuring the sewage treatment efficiency.

[0092] As Figure 5 and Figure 6As shown in the figure, the connecting component 4 includes an intermediate plate 41, side plates 42, a transverse connecting rod 43, and a clamping mechanism 44. Flanges are provided on the opposite faces of the power tank 211 and the communicating tank 212. Among them, two intermediate plates 41 are provided between two rows of mixing tanks 21. Card slots 401 are provided on both sides of the intermediate plate 41, and the card slots 401 are fitted to the power tank 211 or the communicating tank 212. One side plate 42 is provided on each side of the intermediate plate 41. The side plate 42 is provided with a card slot 401 facing the mixing tank 21, and the card slot 401 is fitted to the power tank 211 or the communicating tank 212. The transverse connecting rod 43 is connected to the intermediate plate 41 and the side plates 42. The clamping mechanism 44 is connected to two adjacent side plates 42 to clamp the flanges on the opposite faces of the power tank 211 and the communicating tank 212.

[0093] In the above structure, when the power tank 211 and the communicating tank 212 are docked and closed, it is carried out by the opening and closing driving member 3 cooperating with the connecting component 4.

[0094] Specifically, the intermediate plate 41 of the connecting component 4 is arranged between two rows of mixing tanks 21, while the side plates 42 are arranged on the outside. The intermediate plate 41 and the side plates 42 are engaged with the mixing tank 21 through the card slots 401 to realize the relative limit of multiple mixing tanks 21.

[0095] Among them, the intermediate plate 41 and the side plates 42 are connected and fixed by the transverse connecting rod 43. Specifically, the transverse connecting rod 43 adopts a threaded rod, and is locked and fixed to the intermediate plate 41 and the side plates 42 by cooperating with nuts.

[0096] Furthermore, two intermediate plates 41 are arranged opposite to each other, and side plates 42 are arranged on both sides of the two intermediate plates 41. At this time, the adjacent side plates 42 are connected by the clamping mechanism 44, and the flanges of the power tank 211 and the communicating tank 212 are clamped by the adjacent side plates 42 and the adjacent intermediate plates 41, so as to realize relative fixation. A sealing ring is arranged on the flange surface to ensure sealing.

[0097] Furthermore, the two intermediate plates 41 can also be connected and fixed by the clamping mechanism 44.

[0098] Specifically, the clamping mechanism 44 can adopt a threaded rod cooperating with a nut, and it can also adopt mechanisms such as a locking handwheel to realize locking.

[0099] As Figure 7As shown in the figure, the opening and closing driving member 3 includes a two-way speed reducer 31, a second motor 32, a threaded barrel 33, a screw rod 34, and a cross plate 35. Among them, the two-way speed reducer 31 is relatively fixed to the base 1, and the two-way speed reducer 31 has two output shafts; the second motor 32 is relatively fixed to the base 1 and is connected to the input shaft of the two-way speed reducer 31; one threaded barrel 33 is provided on each of the two output shafts of the two-way speed reducer 31, and each is connected to a screw rod 34; one end of the screw rod 34 is threadedly engaged with the threaded barrel 33, and the other end is fixedly connected to the cross plate 35; the cross plate 35 is connected to the intermediate plate 41, and the length of the cross plate 35 is greater than the distance between the axes of two adjacent mixing tanks 21 in two columns, so that the cross plate 35 abuts against the side plate 42;

[0100] In the above structure, when the opening and closing driving member 3 operates, the second motor 32 drives the two-way speed reducer 31 to operate, thereby driving the threaded barrel 33 to rotate. Through the threaded engagement between the threaded barrel 33 and the screw rod 34, the screw rod 34 will perform a linear displacement. In this way, the intermediate plate 41 and the side plate 42 can be driven to move through the cross plate 35, so as to realize the splitting of the power tank body 211 and the communication tank body 212;

[0101] Before performing this operation, the clamping mechanism 44 needs to be released first. In this way, only the communication tank body 212 will perform displacement; specifically, on the side of the intermediate plate 41 and the side plate 42 corresponding to the communication tank body 212, which is far from the power tank body 211, a limiting plate connected to the communication tank body 212 needs to be provided. In this way, the intermediate plate 41 and the side plate 42 abut against the limiting plate to drive the communication tank body 212 to move, rather than the intermediate plate 41 and the side plate 42 sliding on the communication tank body 212;

[0102] Specifically, the length of the cross plate 35 is greater than the distance between the axes of two adjacent mixing tanks 21 in two columns, and the card slot 401 is set to be semicircular. In this way, the cross plate 35 will abut against both the intermediate plate 41 and the side plate 42 at the same time. When closing the power tank body 211 and the communication tank body 212, the cross plate 35 will apply a stable thrust to make the two butt-join and close, and then a holding force for their tight butt-joining can be applied;

[0103] Among them, the cross plate 35 only needs to be connected to the intermediate plate 41, and the intermediate plate 41 is connected to the side plate 42 by a transverse connecting rod 43.

[0104] As Figures 1 to 3 shown in the figure, three opening and closing driving members 3 are provided, and the three opening and closing driving members 3 are stacked up and down. Among them, in the opening and closing driving members 3 located on the upper side and the lower side, the cross plate 35 abuts against the intermediate plate 41 and the side plate 42;

[0105] As for the above structure, three opening and closing driving members 3 are provided. Among them, only the middle opening and closing driving member 3 adopts the above connection structure. For the upper and lower opening and closing driving members 3, the cross plate 35 is not connected to the middle plate 41. It only needs to provide the thrust when the power tank body 211 and the communication tank body 212 are closed and the holding force after closing, which can prevent the problem that the middle plate 41 is bent due to inconsistent actions of the three opening and closing driving members 3, thereby reducing the requirement for installation accuracy;

[0106] Specifically, a pressure sensor can be arranged on the surface of the cross plate 35 that abuts against the middle plate 41 to ensure that all three opening and closing driving members 3 can abut in place;

[0107] Among them, the screw rods 34 of the upper and lower two opening and closing driving members 3 need to be circumferentially limited to prevent rotation with the threaded barrel 33 and unable to achieve telescoping;

[0108] When performing the opening action, the upper and lower two opening and closing driving members 3 act first to release the abutment against the middle plate 41 and the side plate 42, and then the middle opening and closing driving member 3 drives the communication tank body 212 to move through the middle plate 41 and the side plate 42.

[0109] As Figure 9 shown, the carrier 5 includes a frame body 51, a carrier plate 52 and a positioning plate 53. Among them, the frame body 51 is connected to the base 1 and is located between the two mixing tank groups 2; a plurality of carrier plates 52 are arranged on the frame body 51, and the two-way reduction gear 31 is arranged on the carrier plate 52; a plurality of positioning plates 53 are arranged on the frame body 51, the threaded barrel 33 passes through the positioning plate 53, and the threaded barrel 33 is rotatably connected to the positioning plate 53;

[0110] As for the above structure, in order to ensure the compactness of the overall structure, a carrier 5 is provided for carrying the opening and closing driving member 3. The opening and closing driving member 3 can be connected to the carrier plate 52 of the carrier 5 through the two-way reduction gear 31. Among them, the connection between the frame body 51 and the base 1 plays a role of support and fixation;

[0111] In order to further ensure the cooperation accuracy between the threaded barrel 33 and the screw rod 34, a positioning plate 53 is arranged on the carrier 5 to rotatably connect the threaded barrel 33. A bearing seat can be arranged on the positioning plate 53 to connect the threaded barrel 33, so as to ensure the structural strength, avoid the bending of the threaded barrel 33, and thus ensure the action accuracy;

[0112] At the same time, the setting of this structure enables the opening and closing driving member 3 to drive the opening and closing of the two mixing tank groups 2, making full use of the opening and closing driving member 3.

[0113] As Figure 7As shown in the figure, the cage 6 includes a limit frame 61 and a support frame 62. Among them, the limit frame 61 is arranged between two columns of mixing tanks 21, and the limit frame 61 is snap-connected to the mixing tank 21; the support frame 62 is connected to one column of mixing tanks 21, and the side surface of the support frame 62 is flush with the side surface of the base 1.

[0114] In the above structure, both the limit frame 61 and the support frame 62 are snap-connected to the mixing tank 21 to ensure the relative position stability of multiple mixing tanks 21. At this time, the clamping grooves 401 of the intermediate plate 41 and the side plate 42 do not need to be closely attached to the mixing tank 21 to prevent scraping and damage problems during operation.

[0115] Specifically, when arranging the opening and closing driving member 3, the screw 34 passes through the limit frame 61 of the cage 6. Only one section of thread is provided at the end of the screw 34 that is connected to the threaded cylinder 33. The part passing through the limit frame 61 is set as a spline shaft structure, and the limit frame 61 is provided with a spline hole. In this way, the circumferential limit of the screw 34 can be realized by the cooperation of the spline shaft and the spline hole.

[0116] In this structure, the side surface of the support frame 62 is flush with the side surface of the base 1. Thanks to the structural design of the above-mentioned connection component 4, the mixing device can be laid flat and supported by the support frame 62. Then, the intermediate plate 41 and the side plate 42 can be removed, so that several mixing tanks 21 can be separated, which is convenient for maintenance and assembly work.

[0117] Specifically, the limit frame 61 on the power tank body 211 is fixedly connected to the base 1, and the limit frame 61 on the communication tank body 212 is slidably matched with the base 1.

[0118] In some embodiments, the connection component 4 is only provided with the intermediate plate 41, the side plate 42 and the transverse connecting rod 43. The relative abutting force between the power tank body 211 and the communication tank body 212 is provided by relying on the opening and closing driving member 3, and the intermediate plate 41, the side plate 42 and the transverse connecting rod 43 do not need to be provided on the power tank body 211.

[0119] In the plastic washing wastewater treatment structure of the present invention, the water inlet of the sedimentation tank 8 is communicated with the water outlet of a mixing tank group 2, and the water inlet of this mixing tank group 2 is communicated with the acid liquid output pipe of the bipolar membrane reactor 7; the water outlet of the sedimentation tank 8 is communicated with the water inlet of another mixing tank group 2, and the water inlet of this mixing tank group 2 is communicated with the alkali liquid output pipe of the bipolar membrane reactor 7, and the water outlet of this mixing tank group 2 is communicated with the water inlet of the air flotation tank 9; the water outlet of the air flotation tank 9 is communicated with the water inlet of the aeration tank 10, and the water outlet of the aeration tank 10 is communicated with the water inlet of the secondary sedimentation tank 11; the dosing device 12 is communicated with the bipolar membrane reactor 7.

[0120] In the above structure, the dosing device 12 is used to introduce a chemical agent into the bipolar membrane reactor 7, so as to generate acidic water and alkaline water through the bipolar membrane reactor 7;

[0121] When treating wastewater, it will first enter one of the mixing tank groups 2, and the acidic solution generated at the anode of the bipolar membrane reactor 7 is added for treatment. Subsequently, the wastewater is precipitated in the sedimentation tank 8, and then enters another mixing tank group 2, and the alkaline solution generated at the cathode of the bipolar membrane reactor 7 is added for treatment. After that, the wastewater is treated successively through the air flotation tank 9, the aeration tank 10 and the secondary sedimentation tank 11 and then can be discharged;

[0122] As Figure 10 shown, the bipolar membrane reactor 7 includes an electrolytic cell 71, a power supply 72, an anode plate 73, a cathode plate 74 and an ion exchange membrane 75. The electrolytic cell 71 is used to hold the chemical agent supplied by the dosing device 12, the power supply 72 is used to provide electricity, and two ion exchange membranes 75 are arranged in the electrolytic cell 71 to divide the electrolytic cell 71 into three parts. The two side parts are used to hold the anode plate 73 and the cathode plate 74, and then acidic and alkaline solutions can be generated by electrolysis.

[0123] The application method of the above-mentioned plastic washing wastewater treatment device of the present invention includes the following steps:

[0124] S1. Through the dosing device 12, pure water and sodium chloride, or pure water and sodium sulfate are added into the bipolar membrane reactor 7 to prepare a solution with a mass concentration of 0.5% - 0.2%. Then the prepared solution is input into the bipolar membrane reactor 7.

[0125] S2. The plastic washing wastewater is introduced into the mixing tank 21 of one of the mixing tank groups 2, and the acidic solution generated at the anode of the bipolar membrane reactor 7 is input into the mixing tank 21. At the same time, potassium ferrate with a concentration of 0.1% - 0.5% is added, and the pH value is controlled to be 2.0 - 4.0, and continuous stirring and mixing are carried out for 15 - 30 minutes.

[0126] S3. The plastic washing wastewater is introduced into the sedimentation tank 8 and precipitated for 30 - 60 minutes.

[0127] S4. The plastic washing wastewater is introduced into the mixing tank 21 of another mixing tank group 2, and the alkaline solution generated at the cathode of the bipolar membrane reactor 7 is input into the mixing tank 21. At the same time, sodium hydroxide with a concentration of 0.1% - 0.5% is added, and the pH value is controlled to be 6.5 - 7.0, and continuous stirring and mixing are carried out for 15 - 30 minutes.

[0128] S5. The plastic washing wastewater is introduced into the air flotation tank 9 to remove the air flotation sludge. Subsequently, the plastic washing wastewater is introduced into the aeration tank 10, and the dissolved oxygen in the aeration tank 10 is controlled to be 2.0 - 3.0 mg / L, and the residence time is 16 - 24 hours.

[0129] S6. Introduce the plastic washing wastewater into the secondary sedimentation tank 11 for mud-water separation, and discharge the supernatant after reaching the standard;

[0130] Among them, during shutdown maintenance, the mixing tank 21 is divided into a power tank body 211 and a communicating tank body 212 by the opening and closing driving member 3, and then internal flushing is carried out. After cleaning, the power tank body 211 and the communicating tank body 212 are relatively closed by the opening and closing driving member 3, and the relative abutting force after closing is provided.

[0131] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mixing device, characterized in that: It includes a base (1), a mixing tank group (2), and an opening / closing driving member (3). Among them, Two of the mixing tank groups (2) are oppositely arranged on the base (1); The mixing tank group (2) includes a plurality of mixing tanks (21). The mixing tanks (21) are horizontal tanks. The plurality of mixing tanks (21) are arranged in two columns, and the mixing tanks (21) in a single column are interconnected; The opening / closing driving member (3) is arranged on the base (1), and the opening / closing driving member (3) is located between the two mixing tank groups (2); The opening / closing driving member (3) is used to open the mixing tanks (21) of the two mixing tank groups (2) so as to divide the mixing tanks (21) into power tank bodies (211) and connecting tank bodies (212). The connecting tank bodies (212) are in sliding fit with the base (1), and the opening / closing driving member (3) is used to relatively close the power tank bodies (211) and the connecting tank bodies (212), and simultaneously provide a relative abutting force after closing.

2. The mixing device according to claim 1, characterized in that: The mixing tank (21) further includes a stirring paddle (213), a sprocket (214), a chain (215), a first motor (216), and a connecting pipe (217). Among them, The stirring paddle (213) is located inside the mixing tank (21), and the paddle shaft of the stirring paddle (213) penetrates through the power tank body (211); The sprocket (214) is arranged on the paddle shaft of the stirring paddle (213); The chain (215) meshes with the sprocket (214); The main shaft of the first motor (216) is connected to the paddle shaft of the stirring paddle (213), and the first motor (216) is relatively fixed to the base (1); A plurality of connecting pipes (217) are provided. Each connecting pipe (217) connects two adjacent connecting tank bodies (212) up and down.

3. The mixing device according to claim 2, characterized in that: The mixing tank (21) further includes a water inlet pipe (218), a chemical addition pipe (219), and a water outlet pipe (220). Among them, The water inlet pipe (218) and the chemical addition pipe (219) are connected to the power tank body (211) located at the top in a single column of the mixing tanks (21); The water outlet pipe (220) is connected to the connecting tank body (212) located at the bottom in a single column of the mixing tanks (21).

4. The mixing device according to claim 1, characterized in that: It further includes a connection assembly (4). The connection assembly (4) includes an intermediate plate (41), side plates (42), a transverse connecting rod (43), and a clamping mechanism (44). Flanges are provided on the opposite surfaces of the power tank body (211) and the connecting tank body (212). Among them, Two intermediate plates (41) are provided between the two columns of mixing tanks (21). Slots (401) are provided on both sides of the intermediate plate (41), and the slots (401) are fitted to the power tank body (211) or the connecting tank body (212); One side plate (42) is provided on each side of the intermediate plate (41). The side plate (42) is provided with the slot (401) facing the mixing tank (21), and the slot (401) is fitted to the power tank body (211) or the connecting tank body (212); The horizontal connecting rod (43) is connected to the intermediate plate (41) and the side plates (42); The clamping mechanism (44) is connected to two adjacent side plates (42) to clamp the flanges on the opposite faces of the power tank body (211) and the communication tank body (212).

5. The mixing device according to claim 4, wherein: The opening and closing driving member (3) includes a two-way reduction gear (31), a second motor (32), a threaded cylinder (33), a screw rod (34), and a cross plate (35), wherein, The two-way reduction gear (31) is relatively fixed to the base (1), and the two-way reduction gear (31) has two output shafts; The second motor (32) is relatively fixed to the base (1) and is connected to the input shaft of the two-way reduction gear (31); One threaded cylinder (33) is provided on each of the two output shafts of the two-way reduction gear (31), and each is connected to a screw rod (34); One end of the screw rod (34) is threadedly engaged with the threaded cylinder (33), and the other end is fixedly connected to the cross plate (35); The cross plate (35) is connected to the intermediate plate (41), and the length of the cross plate (35) is greater than the distance between the axes of two adjacent mixing tanks (21) in two columns, so that the cross plate (35) abuts against the side plates (42).

6. The mixing device according to claim 5, characterized in that: Three opening and closing driving members (3) are provided, and the three opening and closing driving members (3) are stacked vertically, wherein, In the upper and lower opening and closing driving members (3), the cross plate (35) abuts against the intermediate plate (41) and the side plates (42).

7. The mixing device according to claim 5, characterized in that: It further includes a carrier (5), and the carrier (5) includes a frame body (51), a carrier plate (52), and a positioning plate (53), wherein, The frame body (51) is connected to the base (1) and is located between the two mixing tank groups (2); A plurality of carrier plates (52) are provided on the frame body (51), and the two-way reduction gear (31) is provided on the carrier plate (52); A plurality of positioning plates (53) are provided on the frame body (51), the threaded cylinder (33) penetrates through the positioning plate (53), and the threaded cylinder (33) is rotatably connected to the positioning plate (53).

8. The mixing device according to claim 1, characterized in that: It further includes a cage (6), and the cage (6) includes a limiting frame (61) and a support frame (62), wherein, The limiting frame (61) is provided between two columns of mixing tanks (21), and the limiting frame (61) is snap-fitted with the mixing tanks (21); The support frame (62) is connected to one column of mixing tanks (21), and the side surface of the support frame (62) is flush with the side surface of the base (1).

9. A plastic washing wastewater treatment system, characterized in that: It includes the mixing device according to any one of claims 1 to 8, and further includes a bipolar membrane reactor (7), a sedimentation tank (8), a flotation tank (9), an aeration tank (10), a secondary sedimentation tank (11), and a chemical dosing device (12), wherein, The water inlet of the sedimentation tank (8) is communicated with the water outlet of one of the mixing tank groups (2), and the water inlet of the mixing tank group (2) is communicated with the acid solution output pipe of the bipolar membrane reactor (7); The water outlet of the sedimentation tank (8) is communicated with the water inlet of another mixing tank group (2), and the water inlet of the mixing tank group (2) is communicated with the alkali solution output pipe of the bipolar membrane reactor (7). The water outlet of the mixing tank group (2) is communicated with the water inlet of the air flotation tank (9); The water outlet of the air flotation tank (9) is communicated with the water inlet of the aeration tank (10), and the water outlet of the aeration tank (10) is communicated with the water inlet of the secondary sedimentation tank (11); The chemical dosing device (12) is communicated with the bipolar membrane reactor (7).

10. A method for applying the plastic washing wastewater treatment system as described in claim 9, characterized in that, It includes the following steps: S1. Through the chemical dosing device (12), pure water and sodium chloride or pure water and sodium sulfate are added into the bipolar membrane reactor (7) to prepare a solution with a mass concentration of 0.5% - 0.2%. Then the prepared solution is input into the bipolar membrane reactor (7). S2. The plastic washing wastewater is introduced into the mixing tank (21) of one of the mixing tank groups (2), and the acid solution generated at the anode of the bipolar membrane reactor (7) is input into the mixing tank (21). Meanwhile, potassium ferrate with a concentration of 0.1% - 0.5% is added, and the pH value is controlled to be 2.0 - 4.

0. Continuous stirring and mixing are carried out for 15 - 30 min. S3. The plastic washing wastewater is introduced into the sedimentation tank (8) for sedimentation for 30 - 60 min. S4. The plastic washing wastewater is introduced into the mixing tank (21) of another mixing tank group (2), and the alkali solution generated at the cathode of the bipolar membrane reactor (7) is input into the mixing tank (21). Meanwhile, sodium hydroxide with a concentration of 0.1% - 0.5% is added, and the pH value is controlled to be 6.5 - 7.

0. Continuous stirring and mixing are carried out for 15 - 30 min. S5. The plastic washing wastewater is introduced into the air flotation tank (9) to remove the air flotation sludge. Subsequently, the plastic washing wastewater is introduced into the aeration tank (10). The aeration tank (10) controls the dissolved oxygen to be 2.0 - 3.0 mg / L, and the residence time is 16 - 24 h. S6. The plastic washing wastewater is introduced into the secondary sedimentation tank (11) for sedimentation separation. The supernatant is discharged after reaching the standard. Among them, during shutdown maintenance, the mixing tank (21) is divided into a power tank body (211) and a communication tank body (212) by the opening and closing driving member (3). Then internal flushing is carried out. After cleaning, the power tank body (211) and the communication tank body (212) are relatively closed by the opening and closing driving member (3), and a relative holding force after closing is provided.

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